Scraper for boiler hand-holes.



o. BACHE e. c/BERGf `SCJRIIPIRII-OR BOILER HAND HOLES.

' APPLICATION FILED SEPT. I. I9I5. Leeexee.,

Patented Sept. 11, 191?.

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SCB/APER FOR BOILER HAND-HOLES.

Specification of Letters Patent.

Patented Sept. 11, 1917.

Application filed September 1, 1915. Serial No. 48,530.

To all 'whom t may concern.'

Be it known that we, OTTO Bacini, a subject of the Emperor of Germany, and CHARLES BERG, a citizen of the United States, residing at San Francisco, in the county of San Francisco and State of California, have invented new and useful Improvements in Scrapers for Boiler Hand- Holes, of which the following is a specication.

The present invention relates to a scraper for scraping smooth the inner surface of a sheet of metal around the hole therein which is accessible only through said hole. lt is particularly intended for the scraping of the inner surface of the hand-hole sheets of water-tube boilers. Against these handhole sheets are placed gaskets which have to be removed from time to time in order to remove the hand hole plates for the purpose of cleaning the water tubes on the boilers, and if the surface of the hand-hole sheets is not perfectly smooth when the gasket is rcplaced, there is liable to be a leakage of water therebetween.

The object of the present invention is to provide a device by which the cleaning or scraping of these sheets can be effected very expeditiously.

In the accompanying drawing, Figure 1 is a broken side view of a water-leg of a boiler to which our improved scraper is shown as applied; Fig. 2 is an enlarged detail side view of a modified form of the invention.

Referring to the drawing, 1 indicates a water leg of a water-tube boiler, of which the hand-hole sheet 2 has handh0les 3 therein, fitted with hand-hole plates el, held in place by guards 5, secured by nuts 6, screwed on threaded stems 7, projecting from the hand-hole plates through the hand-holes, there being interposed lead or other gaskets S, between the hand-hole plates and the hand-hole sheet. It is very necessary that the inner surface of the hand-hole sheet around the hand-holes, which is in contact with the gasket 8, should be perfectly smooth, otherwise leakage of water will occur. Consequently it is the custom to rcmove these hand-hole plates every two, three or four weeks, and clean said inner surface by a knife or other implement held in the hand on account of the small size of the holes. This operation is very laborious and insufficient. Instead thereof, We employ the scraper shown in Fig. 2, in which 11 indicates a plate, the main body of which can be tted in the hand-hole, but having a flange 12, resting against the outer surface of the hand-hole sheet, and having a central hole and an integral sleeve 13 around said hole, terminating at its outer end in a handle 14. Said sleeve forms a bearing for a spindle 16 which is slotted, as shown at 17, at its inner end, and through such slot extends a scraper 18, pivotally secured by a pivot 19 to the spindle. Upon the outer end of the spindle is secured a handle 21, and between the handles21 and 1li, a handle 22, having a sleeve 23 around the spindle, is adjustably secured on such spindle by means of a set screw 24;, screwed through said sleeve and bearing against said spindle. Between said sleeves 13 and 23 is a compressed coiled spring 26 around the spindle. The pressure of the spring can be varied as desired by removing the set screw 24 and then removing the sleeve 23 to increase or decrease the extent of compression of said spring, and then replac ing said screw.

The implement is used in the following manner: The handles 14 and 22 are grasped by the hands on opposite sides .of the spindle and pressed together, compressing the coiled spring 2G, and causing the plate 11 to be separated from the scraper 18 to such a dis-4 tance that said scraper can readily be passed through the hand-hole so that its two ends can rest against the inner surface of the hand-hole sheet. The pressure upon the handles 14 and 22 is then relaxed, while at the same time the plate 11 is guided into the lhand-hole so that the parts assume the position, as shown in Fig. 2. rThe spindle is then turned by means of the handle 21, and thus the scraper is caused to scrape the marginal portion of the inner-surface of the hand-hole sheet around the handehole, with a pressure equal to that of the coiled spring. When the hand-hole sheet has been suiii ciently scraped the device is removed in the manner similar to that which it was inserted and is applied to another hand-hole.

The scraper may be metallic, as shown in Fig. 2, or it may be a stick 2S of carborundum or other abrasive substance received in a channel-shaped holder 29 pivotally secured in an apertured extension 30 of the spindle. The implement can be used. for scraping the inner surface of a plate having holes which are oval or angular in. forni equally as well as those which are circular, it beingl only necessary that the extreme diameter of the plate l1 should not be less than the minimum diameter of the hole and that the length of the scraper not less than the maximum diameter of the hole.

By means of this device the marginal portions of the inner surface of a sheet around a large number of hand holes can be cleaned Very rapidly. This is of importance when it is remembered that a boiler may contain two or three hundred tubes and corresponding marginal portions to be cleaned.

Wev claim:

In an implement of the class described, the combination vof a spindle, means supported thereby for scraping the inner side of an apertured plate, a bearing for the spindle provided With -means for engaging the outer side of said plate7 handles secured respectively to said spindle and bearing, and eachy extending in opposite directions from 'the part to Which it is secured7 and a coiled Copies of this 'patent may be obtained for vecei'nts each, by addressing the Commissioner of Patents. Washington, D. C. 

